Formulating the optimum parameters of modified hanger system in the cable-arch bridge to restrain force fluctuation and overstressing problems

Farahmand‐Tabar, Salar; Barghian, Majid

doi:10.1007/s40430-020-02513-0

Cited by 13 publications

(4 citation statements)

References 35 publications

(36 reference statements)

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“…Per (1987) proposed a network arch bridge and it saves half the weight of steel compared with similar spans of conventional steel bridges. Farahmand and Barghian (2020aBarghian ( , 2020b proposed a cable-stayed arch bridge with a hanger system and the stiffness and human comfort level for the bridge were well improved by modifying the hanger system.…”

Section: Introductionmentioning

confidence: 99%

Structural form and experimental research of truss arch bridge with multi-point elastic constraints

Qiu

Xie

Pang

et al. 2021

Advances in Structural Engineering

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With the increase of the arch bridge span, the mechanical properties of arch bridges will decrease rapidly. In order to solve this problem, triangular net is set between the arch rib and girder to form a kind of truss arch bridge in which arch rib acts as top chord, girder acts as lower chord, triangular net acts as web member, and hangers provide elastic restrains at several points. The triangle stability of the truss can improve linear stiffness of arch rib and girder, which will thus improve the mechanical properties of arch bridges. A test bridge with a span of 50 m was built to prove the superiority of the truss arch bridge with multi-point elastic constraints (MTAB). Structural stresses and displacements were obtained through dead load experiments, and the mechanical properties of the structure were calculated through the finite element (FE) software. It is turned out that, compared with the conventional through arch bridge (CTAB), the mechanical performance of the MTAB is greatly improved. The test values of structural stresses and displacements match calculation values well. Moreover, with the same steel consumption, the more layers of the triangular net, the better the mechanical properties of the structure.

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Section: Introductionmentioning

confidence: 99%

Structural form and experimental research of truss arch bridge with multi-point elastic constraints

Qiu

Xie

Pang

et al. 2021

Advances in Structural Engineering

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“…ese methods can enhance the torsional stiffness of the girder, thus improving the stability and safety of the structure. Also, by changing the form of cable frames [17,18] and adjusting vertical interval and numbers of cable frames [19], some scholars have improved the stiffness of the structure, reduced vibration, and strengthened the dynamic behavior of the bridge. However, these methods increase the stability of the bridge structure merely at a higher cost and do not really solve the problem that the torsional stiffness simulation of the girder is distorted when the bridge structure is simulated by the IBEM.…”

Section: Introductionmentioning

confidence: 99%

Torsional Stiffness Correction of the Split-Type Triple-Box Steel Box Girder Based on Refined Simulation

Tang

Yue

et al. 2021

Advances in Civil Engineering

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Split-type steel box girders are widely used in long-span bridges because of their good wind-resistance performance. In the design stage, a simple finite element model is usually established based on the beam element for wind-resistance design. However, since the irregular cross-beams and diaphragms in the split steel box girder cannot be virtually established, the stiffness of the girder will be underestimated. To improve the accuracy in simulating stiffness of the split-type triple-box steel box girder (STSBG) with the beam element model (BEM), a correction is made to the initial beam element model (IBEM) based on the result of a more refined finite element model. ANSYS is adopted to make a refined model (RM) of a bridge with STSBG as its girder and to calculate its aerostatic responses and dynamic characteristics in 3 typical construction states and 1 finished state. With the reference value, an objective function of the overall residual sum of squares is constructed for the torsion angle of the girder and the frequency of the bridge. Then, the beam element is used for conventional modelling of the bridge, and artificial bee colony (ABC) algorithm is adopted for the optimization and correction of structure parameters of the BEM of the girder. Finally, static and dynamic characteristics of the IBEM and the corrected beam element model (CBEM) are compared with values of the corresponding RM to evaluate the validity of the correction of the model. The results show that the aerostatic responses and dynamic characteristics of the CBEM are close to calculated values of the RM. In more detail, the relative error between the torsion angle of the girder in the middle span of the BEM and the corresponding reference value in the finished state is decreased from +61.71% to +4.94%, and the relative error of torsional fundamental frequency is decreased from −17.43% to +3.66%. According to the calculated value of the RM, ABC algorithm would satisfactorily improve the accuracy in simulating torsional stiffness of the STSBG with the IBEM. This research is expected to provide reference for beam element modelling, which is conducive to accurately simulating torsional stiffness of the STSBG.

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“…A number of beautifully shaped arch bridges have emerged in the world. [3][4][5] The butterfly-shaped concrete-filled steel tube arch bridge is one of them with unique esthetics. However, such arch bridges have complex stress forms, due to statically indeterminate, irregular shape, material and geometrical nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic evaluation of a butterfly-shaped concrete-filled steel tube arch bridge through numerical analysis and field tests

Ren

Zhu

et al. 2021

Advances in Mechanical Engineering

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The butterfly-shaped concrete-filled steel tube (CFST) arch bridge is an irregular bridge with unique esthetics. In this paper, this new shape of CFST arch bridge is introduced, and a refined three-dimensional finite element model (FEM) is established to evaluate static and dynamic behavior of the bridge. In order to reduce model errors, the FEM is calibrated according to numerical analysis and field tests. Static calculation results show that the butterfly-shaped bridge has good structural performance. The bending moment and axial force of the arch ribs increase when the camber angle of suspender changing from 15° to 50°. Dynamic test is carried out by ambient vibration testing under traffic and wind-induced excitations. The modal parameters of the bridge were calculated by the stochastic subspace identification method in the time domain. In terms of natural frequencies and mode shapes, the FEM analysis was validated by experimental modal analysis. The updated model thus obtained can be treated as a baseline finite element model, which is suitable for long term monitoring and safety evaluation of the structure in different severe circumstances such as earthquakes and wind loading in future.

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Formulating the optimum parameters of modified hanger system in the cable-arch bridge to restrain force fluctuation and overstressing problems

Cited by 13 publications

References 35 publications

Structural form and experimental research of truss arch bridge with multi-point elastic constraints

Structural form and experimental research of truss arch bridge with multi-point elastic constraints

Torsional Stiffness Correction of the Split-Type Triple-Box Steel Box Girder Based on Refined Simulation

Static and dynamic evaluation of a butterfly-shaped concrete-filled steel tube arch bridge through numerical analysis and field tests

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